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Figure 5 | BMC Pregnancy and Childbirth

Figure 5

From: Uterine artery Doppler in the management of early pregnancy loss: a prospective, longitudinal study

Figure 5

Receiver-operator characteristic (ROC) curve for the different values of the pulsatility index concerning the discrimination between groups (I + II) and III. The curve describes the association between sensitivity and specificity at different cut-offs of the pulsatility index. Values from 1 to 8 in intervals of 0.5 are identified with a circle. The point in the curve that is closer to the upper-left corner of the plot corresponds to the value 2.78 of the pulsatility index. At that cut-off point, the sensitivity and specificity values of the pulsatility index in the uterine artery were 77.0% (CI 95%: 71.8%-81.6%) and 75.0% (CI 95%: 57.9%-86.8%), respectively; the area under the curve (AUC) was 0.796 (0.727-0.865). The correspondent positive and negative predictive values were 96.5% and 27.0%, respectively. The likelihood ratio (LR) for a positive or negative test was 3.08 (CI 95%: 1.68%-5.63%) or 0.31 (CI 95%: 0.23%-0.41%), respectively.

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